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diff --git a/devtools/server/tests/mochitest/test_inspector_getImageDataFromURL.html b/devtools/server/tests/mochitest/test_inspector_getImageDataFromURL.html
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+++ b/devtools/server/tests/mochitest/test_inspector_getImageDataFromURL.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+Tests for InspectorActor.getImageDataFromURL() in following cases:
+ * Normal case, image loads after a small delay.
+ * Image takes too long to load (the method rejects after a timeout).
+ * Image fails to load.
+
+https://bugzilla.mozilla.org/show_bug.cgi?id=1192536
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1192536</title>
+
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+  <script type="application/javascript;version=1.8" src="inspector-helpers.js"></script>
+  <script type="application/javascript;version=1.8">
+
+const flags = require("devtools/shared/flags");
+const wasTesting = flags.testing;
+SimpleTest.registerCleanupFunction(() => flags.testing = wasTesting);
+
+const PATH = "http://mochi.test:8888/chrome/devtools/server/tests/mochitest/";
+const BASE_IMAGE = PATH + "inspector-delay-image-response.sjs";
+const DELAYED_IMAGE = BASE_IMAGE + "?delay=300";
+const TIMEOUT_IMAGE = BASE_IMAGE + "?delay=50000";
+const NONEXISTENT_IMAGE = PATH + "this-does-not-exist.png";
+
+window.onload = function() {
+  SimpleTest.waitForExplicitFinish();
+  runNextTest();
+}
+
+var gInspector = null;
+
+addTest(function setup() {
+  let url = document.getElementById("inspectorContent").href;
+  attachURL(url, function(err, client, tab, doc) {
+    let {InspectorFront} = require("devtools/shared/fronts/inspector");
+    gInspector = InspectorFront(client, tab);
+    runNextTest();
+  });
+});
+
+addTest(function testTimeout() {
+  info("Testing that the method aborts if the image takes too long to load.");
+
+  // imageToImageData() only times out when flags.testing is not set.
+  flags.testing = false;
+
+  ensureRejects(gInspector.getImageDataFromURL(TIMEOUT_IMAGE),
+    "Image that loads for too long").then(runNextTest);
+});
+
+addTest(function testNonExistentImage() {
+  info("Testing that non-existent image causes a rejection.");
+
+  // This test shouldn't hit the timeout.
+  flags.testing = true;
+
+  ensureRejects(gInspector.getImageDataFromURL(NONEXISTENT_IMAGE),
+    "Non-existent image").then(runNextTest);
+});
+
+addTest(function testNormalImage() {
+  info("Testing that the method waits for an image to load.");
+
+  // This test shouldn't hit the timeout.
+  flags.testing = true;
+
+  checkImageData(gInspector.getImageDataFromURL(DELAYED_IMAGE)).then(runNextTest);
+});
+
+addTest(function cleanup() {
+  delete gInspector;
+  runNextTest();
+});
+
+/**
+ * Asserts that the given promise rejects.
+ */
+function ensureRejects(promise, desc) {
+  return promise.then(() => {
+    ok(false, desc + ": promise resolved unexpectedly.");
+  }, () => {
+    ok(true, desc + ": promise rejected as expected.");
+  });
+}
+
+/**
+ * Waits for the call to getImageData() the resolve and checks that the image
+ * size is reported correctly.
+ */
+function checkImageData(promise, { width, height } = { width: 1, height: 1 }) {
+  return promise.then(({ size }) => {
+    is(size.naturalWidth, width, "The width is correct.");
+    is(size.naturalHeight, height, "The height is correct.");
+  });
+}
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1192536">Mozilla Bug 1192536</a>
+<a id="inspectorContent" target="_blank" href="inspector_getImageData.html">Test Document</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>